Malicious PDF — malware analysis report

Static analysis result for SHA-256 7194e7b3a5613b5b…

MALICIOUS

PDF

71.4 KB Created: 2020-11-13 16:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0bac2efe2d89b758cc839187cbf6c917 SHA-1: bba54158283309176a64fb75b1afd399fdf4928d SHA-256: 7194e7b3a5613b5b5f18b99010c7a19a352a7fa3105a058d49771135c00a3848
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/strik?utm_term=fire+emblem+three+houses+lost+guide PDF link annotation
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/7885858.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/cd980450e1d01c9.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/632ca5f1.pdfIn PDF document text
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/zegipitimixezajegaj.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/eef73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_5fa1ed5e446cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4f4dd604-b532-40c3-9d9e-e31c4b92238c/70575079827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76890870-2643-4dbd-a9e2-f9881d638f77/ecole_des_fans_maman_trompe_papa_avec_tonton.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/form_and_space_interior_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91546482-3246-4b94-906e-2fe41fb79386/gufujesu.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/tatifisubewedusodusodufej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b5634e-1fd1-41fc-9ce9-a908ca34b072/a13_bionic_cpu_performance.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 4900 bytes
SHA-256: 5cf143500ca1be6107023eefc5713f1a4b9b0c4839c643a8bd8e7eb8d9f50901
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 10448 bytes
SHA-256: 2540d37e1bbcecb14c5b979777f21e596f334a20396619c9052d2fa9741d861f
font_02_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378